Home > Active Directory > Windows 2003 DCPROMO Fails: “Version of the active directory schema of the source forest is not compatible”

Windows 2003 DCPROMO Fails: “Version of the active directory schema of the source forest is not compatible”

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This issue may occur when Active Directory has not been updated with the Windows Server 2003 R2 schema extensions.

To resolve this issue, run the adprep.exe /forestprep command from the Windows Server 2003 R2 installation disk 2 on the schema master. To do this, insert the Windows Server 2003 R2 installation disk 2, and then type the following command:

Drive:\CMPNENTS\R2\ADPREP\adprep.exe /forestprep

Once, complete, rerun your DCPROMO and the issue should be resolved.

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Categories: Active Directory
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